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Environmental Engineering - Interview Questions and Answers

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6. Dissolved oxygen in streams is
A. maximum at noon
B. minimum at noon
C. maximum at midnight
D. same throughout the day
Explanation:
7. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
A. TOD>BOD>COD
B. TOD>COD>BOD
C. BOD>COD>TOD
D. COD>BOD>TOD
Explanation:
8. Which of the following retards the self purification of stream ?
A. higher temperature
B. sunlight
C. satisfying oxygen demand
D. none of the above
Explanation:
9. The ratio of 5 day BOD to ultimate BOD is about
A. 1/3
B. 2/3
C. 3/4
D. 1.0
Explanation:
10. The effect of increasing diameter of sewer on the self cleansing velocity is
A. to decrease it
B. to increase it
C. fluctuating
D. nil
Explanation:
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